Colloquium Schedule

Colloquium: Thursday, February 27th, 4:25 PM, Lewis Lab 316

Is There Still Life in Entropy?

Daan Frenkel

University of Cambridge
Entropy is a well-known, but not necessarily well-understood concept. Initially introduced in the context of thermodynamics, it was given a microscopic interpretation by Boltzmann and Gibbs in the context of equilibrium statistical mechanics. But more recently, entropy like quantities have been introduced to describe non-equilibrium systems. For instance, in an attempt to construct a Statistical Mechanics of Powders, Sir Sam Edwards introduced the concept of "granular entropy", defined as the logarithm of the number of distinct packings of N granular particles in a fixed volume V. In 1989, the proposal was rather controversial but much of the debate was sterile because the granular entropy could not even be computed for systems as small as 20 particles - hardly a good approximation of the thermodynamic limit.

In my talk I will describe how granular entropies of much larger systems can now be computed, using a novel algorithm. Interestingly, it turns out the definition of granular entropy will have to be modified to guarantee that granular entropy is extensive. Which brings us back to the Gibbs paradox and a dirty secret of colloid science.

Click Here for full announcement

Physics and Astronomy Colloquia are usually scheduled for Thursdays at 4:25 PM in Lewis Lab room 316. Refreshments and snacks are available in the nearby coffee room at 4:00 PM.


Physics Colloquium Schedule for Fall 2019

Click on Title below for past or upcoming Announcements (where available), and Speaker name for website.        

January 20---
January 23---
January 30Ekhard K.H. SaljeCambridge UniversityFerroelectrics and Ferroelastics far from Equilibrium: Avalanche Spectroscopy 
February 6Lisa A. FredinLehigh UniversityImportance of Disorder in Experimentally Relevant Models
February 13Dragan HutererUniversity of MichiganNew Views of the Universe
February 20---
February 27Daan FrenkelCambridge UniversityIs There Still Life in Entropy?
March 5---
March 19Antal JevickiBrown University -
March 26William PhillipsNIST-
April 2Edward LymanUniversity of Delaware-
April 9Babak SeradjehIndiana University-
April 16---
April 23Velia FowlerUniversity of Delaware
April 30Liam McAllisterCornell-